Michael Gaffney, 21, Maywood, was charged after Francis Victoria Garcia’s body was found around 2:15 a.m. Saturday near 140 Prospect Avenue in Hackensack, the Bergen County Prosecutor’s Office said.

The man told police they were having sex in Garcia’s car for about 20 minutes, and at one point put his hands around her neck, according to an affidavit of probable cause filed by police. She then lost consciousness, according to the affidavit.

At some point, Gaffney contacted a group of friends who were close by and told them Garcia wasn’t breathing, authorities said. A male friend went to the parking garage and noted that Garcia’s lips were purple, but he could feel air coming out of her nose, the affidavit said.

Gaffney told police he knew Garcia through mutual friends and had communicated through social media, authorities said. The two made plans to hang out with a group of friends on Friday and Gaffney picked her up around 4 p.m., the affidavit said. Two friends -- a male and female -- were already in the backseat when she picked up Gaffney, the affidavit said.

The two went to the home of another friend on Prospect Avenue and Garcia and Gaffney went to her car at one point to hang out, the affidavit said.

Garcia was taken to Hackensack University Medical Center when police found her and pronounced dead at approximately 2:58 a.m., the affidavit said. An autopsy determined her death was caused by neck compression from another person, authorities said.

The medical examiner also found she had a blood-alcohol level of .256, according to the affidavit.